US 5,969,458 A · Permanent magnetic field starter motor

Abstract

In a permanent magnet field starter motor, a ring shaped enlarged portion is formed at an end of a yoke and has an inner diameter Da which is larger than an inner diameter of the yoke. The inner diameter Da of the enlarged portion is at least as large as an outer diameter Db of a brush member holder plate which is inserted to an inner side of the enlarged portion, so that the radial position between the yoke and the brush member holder plate is directly aligned. A cut-out groove is formed on the yoke for inserting a bush member. The bush member is inserted into the cut-out groove, so that a thrust direction position of an outside portion lead wire, a lead terminal, and a lead wire is determined. A projection formed on the brush member holder plate has a width Wb which is at least as large as the width Wa of the cut-out groove. By inserting projection into the cut-out groove, the circumferential position between the yoke and the brush member holder plate is aligned.

Claims6

Dependent claims

A permanent magnetic field starter motor comprising:

a cylindrical shaped yoke having a central portion and end portions at opposite axial extremities thereof;
a plurality of permanent magnets aligned and arranged at an inner peripheral face of the central portion of the cylindrical shaped yoke;
a disc shaped brush member holder plate having a radially extending projection at a periphery thereof;
and
plus and minus side brush members arranged on the disc shaped brush member holder plate;
wherein
an enlarged portion is formed at a first end portion of the yoke said enlarged portion having an inner diameter which is larger than an inner diameter of said central portion and larger than an outer diameter of the brush member holder plate;
a cut-out groove is formed at the first end portion of the yokes;
the brush member holder plate has an outer diameter which is larger than the inner diameter of the central body, and is arranged at an inner periphery of the enlarged portion, with the projection of the brush member holder plate inserted into the cut-out groove;
whereby the permanent magnets and the brush member are aligned both radially and circumferentially.

7 more elements

Dependencies are inferred from the claim text.

Permanent magnetic field starter motor

Life of this patent

Permanent magnetic field starter motor

Life of this patent

Abstract

Claims6